Journal
NATURE COMMUNICATIONS
Volume 2, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms1209
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Funding
- NSF [CHE-0809420, DMR-0748834]
- NIH [1DP2OD007246-01, 1R21EB009486 A, 1R21CA139329 Z]
- Siteman Centre for Cancer Nanotechnology Excellence-Centre for Nanoscale Science and Technology
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0005039]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0809420] Funding Source: National Science Foundation
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Water-soluble peptides that adopt stable helical conformations are attractive motifs because of their importance in basic science and their broad utility in medicine and biotechnology. Incorporating charged amino-acid residues to improve peptide solubility, however, usually leads to reduced helical stability because of increased side-chain charge repulsion, reduced side-chain hydrophobicity and the disruption of intramolecular hydrogen bonding. Here, we show that water-soluble, ultra-stable a-helical polypeptides can be produced by elongating charge-containing amino-acid side chains to position the charges distally from the polypeptide backbone. The strategy has been successfully applied to the design and synthesis of water-soluble polypeptides bearing long, charged side chains and various functional moieties that possess unusual helical stability against changing environmental conditions, including changes in the pH and temperature and the presence of denaturing reagents.
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